This isn't required, but you will notice a big quality difference if you run the normalized files through Audacity and set the volume to -3 (Recommendation from the Asterisk PDF). There's most likely a way to do this with SOX, I just haven't tried hard enough to find it. If/when you do, please post that.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Johan Wilfer Sent: Tuesday, August 28, 2012 9:40 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: [asterisk-users] How do you convert your prompts to an asterisk-friendly format? Hi, I've used the shells-script at the end of this email to generate 8khz mono wave-files for asterisk from a 144 khz recording. The script does two things: resample & normalize the audio volume. Anyone like to share their recommendations / scripts for doing this conversion? I've just converted to 8khz wave, should I convert to something else? For the googler in the future this is my current script (which I hope to improve): BASEDIR=`dirname $0` PROMPTDIRS="dir1 dir2" for dir in ${PROMPTDIRS} do src=${BASEDIR}/recordings/prompts/${dir} dst=${BASEDIR}/generated/prompts/8khz/${dir} for i in ${src}/*.wav; do sox "$i" -V -r 8000 -c 1 -q -s \ "${dst}/$(basename "$i" .wav).wav" vol 0.8; done normalize-audio -a -20dBFS "${dst}"/* done -- Johan Wilfer JT Technologies & Telecommunications AB Jabber: [email protected] | Phone: +46 31 3809100 -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
